I like the idea, but I don't think getting rid of the interaction is the best way to go about it since it would be confusing for new players. Maybe just making it so zephyrus no longer offers sac pact, but I honestly don't think that is enough to make Jarraxus playable.

To be fair to trump, control warlock was not a competitive deck and only became competitive during KnC, which was also only because of mana cheating. So trump was 100% correct with 1 star defile for that one meta.